Bumper



Aug. 19, 1930. p, $ERvA|$ V 1,773,5Q2

BUMPER Filed July 26. 1929 INVEN TOR F/jAN/f f? amvA/a B W ATTORNEY Patented Aug. 19,

F DETROIT; MICHIGAN, A conronnmronzor-DELAWARE; J

bumper which will create a minimum of dis turbance in the air-streams at the front of an automobile; t0 providea bumper which wlll reduce the-resistance to a'minimum when proj ected through the airat high speeds and to provide means mounted in advance ofthe front end of a motor car for splitting the ,airstreams Without-causingsubstantlal turbulence therein- An illustrative embodiment of this invention is shown in in which:

Fig. 1 isa view in side elevation of a mo I tor car equipped with the" improved bumper;

-510f Fig. 2. i In the'construction of modern motor cars,- practic'ally every car is equipped and provided with a bumper which is mounted on Fig. 2is a top plan'viewof the bumper atf tached to fragmentary front ends of a chassis frame. p h l Fig. 3 1s a view in front elevat on of a double bar bumper embodying the newim provements. g p

Fig. 4 is a sectional View taken on the hue 4-4. of Fig. 2.

. Fig. 5 is a sectlonal View taken on the line brackets at, and in advance of,the front end of the car. Practically all of these bumpers are made of flat spring steel strips and are mounted With the flat surface thereof in a vertermined that slight disturbances in the stream line flow of air atthe front end of an elongated body, which cause turbulency in the theaccompanying drawings I Application filed. July 26, 1929. Serial N'o. 381,192.

1 amg"brackets-.2 and a. rear ends same direction and plane.

The bumperflba'r 6 with its 'curved-eii dsfis FRANK r. sErwAIs, or DETROIT, IcHre mvAssIGnoRmo .cirnrsnnnconrone'rrou;

-. ofwhichfare securedto the'chas'sis side frames I 4 and '5 respectively. The front ends ofthe shaped sofasto be'of truestream line cross,

section all 'points of verticalsections taken at" right; angles to' the longitudinal axis of the straightportion of thebumper bar which erablyof a fineness 'ratio pffabout 3.5 :15 and" disposed. betweenitstsupporting brackets. .Thlsstream line'shapeiofsthebar is pref ifitfisso'desired this same'ratiomay-bere raised at thetentire barf When this isthe case,"the'f'rearwardly; curved ends 7' and :8 will necess'ar ly havea greater thickness "than the medial portion of the bar as it be ap .parent?that'the;length of a section taken.

through these curved ends as shown inFig. 4;- i

will be greaterithan thelength offa section takenjthrough' the straight portionqof the bar'as shown; in Fig. 5. H

" In'theuseof hisj'improvedbumper'pitis mounte'dlat; and in advance of, the frontend of the motor vehicle and when thus positioned will perform the customary function of protecting theifrontend ofthe vehicle. When the fvehiueis being driven forwardly the bumper. itself will present comparatively Ii-ta tle resistance toithe air and at fthe same time perform the furtheruseful function of splitting the air streams'without causing substan Y .tial turbulency therein so that the air streams will pass rearwardlyt to the jcarin' substantially unbroken andundisturbed flow.

In'tl eembod'iment shown" in Fig.3 of'the drawings, a pair of horizontally disposed bars 10 and llare mounted invertically spaced parallel relation to each" other. These bars are each of substantially the same conformation as the single bar illustrated in Figs..1 and2. r

Although but one specific embodiment and one modification thereof have been herein shown maybe altered or omitted without departing from the spirit of this invention as defined by the following claims.

I claim:

1. A bumper for motor vehicles having a cross section of substantially stream-line shape a i A bumper for motor vehicles comprising 2. v a horizontally disposed member having the ends thereof curved in the same direction and plane',said bumper being of strealn-lin'e' shape at all points of vertical cross section's'taken at right angles to the longitudinal axis of the straight portion of said horizontally disposedmember. a I a 3. The combination of a motor vehicle and means mounted on the front end of said ve-' hicle and in advance-thereof ofsubstantially stream-line shape for splitting the air streams Without causing substantial turbulence there- 4. The combination of a motor vehicle and a stream-line bumper having a cross section of substantially stream-line shape mounted on the front end of said vehicle and in advance thereof for, splitting the air streams ivithout causing substantial turbulence there- 111.

5. The comb inationof a motor vehicle and a horizontally disposed member mounted on and inspaced relation to the'front end of said vehicle, said member beingof stream-line shape in vertical cross section for, splitting the air streams Without causing substantial turbulencetherein.

6. A bumper for motor'vehi'cles having a cross section of substantially stream-line shape throughout ts length, said bumper varying in cross sectional area. I

7. A bumper for motor vehicles having an irregular outline and a cross section of substantially stream-line shape throughout its length, said bumper varying in cross sectional area. a i

8. Abumperfor motor vehicles" having an irregular outline and acrossse'c tionof substantially stream-line shape and having a uniform fineness ratio. I

9. The combination of a motor vehicle and means mounted on the front end of said vehicle and in advance thereof of substantially stream-line shape having a uniform fineness ratio throughout its length.

10. A bar having an irregular outline and a cross section of substantially stream-line shape throughout its length and having a uniform fineness ratio FRANK P, SERVAIS. 

